Valve arrangement for fluid-transmission gears.



H. LENTZ. VALVE ARRANGEMENT FOR FLUID TRANSMISSION GEARS. APPLIOATION FILEDSEPT.1,1909.

' 986,834, 7 Patented Mar. 14, 1911.

Hugo LENTZ,

. JNVEN'T'OR.

'the various valve-ports 'lieved rotary valve for UNITED STATES PATENT OFFICE.

mmo LENTZ, or MANNHE'IM, GERMANY.

VALVE ARRANGEMENT FOR FLUID-TRANSMISSION GEARS.

Specification of Letters Patent.

Patented Mar. 14, 1911.

Application filed September 1, 1909. Serial No. 515,703.

To all whom it may concern:

Be it known that I, Huoo LnN'rz, a subject of the German Emperor, andresiding at Mannheim, Germany, have invented a new and useful Valve Arrangement for Fluid- Transmission Gea'ryand I do hereby declare the following to be a full clear, and exact description of the same.

The present an rovements relate to-valves especially useful or pressure pumps of iluid transmission gear, and theobject of the invention is the production of a valve for throwing into action one or more pressure pumps. i

This invention may be used with especial advantage in that form of transmission gear described in .my pending application, Serial N o. 1 1,142, filed August 26, 1909, for Letters Patent,,'in-'which are employed two pressure pumps and two pressure motors, a valve (which inaybethat of the present invention) being used to set in action either or both of the' umps. i

The form 0 the invention illustrated in the accompanying drawings shows'a re the primary pumps of fluid transmission gear'in motor cars, by means of whichit is possible to switch on and off, separately or simultaneously, the pumps directly driven from the motor, in

order to cause a quantity of fluid, corrc-- spondin to the desired speed, to act on the motors %or secondary pumps) which rotate the wheels of the car, page thereof.

The accompanying drawings show an embodiment of my invention.

Figure 1 is a front view of a valve for throwing into action either or both of two primary pumps (rotary); Fig. 2 is a longitudinal section of a valve casing, and of a pump casing with the pumps inserted; Figs. 310, to be readairs, (first) 3 and 4, (second) 5 undo, mild) 7 and 8, (fourth) 9 and 10, indi ate the relation of to the primary pumps, at various positions of the valve corresponding to the-different speeds of the or to produce a stopmotors and to the car when stationary.

pump into action. The valve has two sets of ports, ports being intended for connect-' ing the chamber 1' of the valve with pressure pump 11 and ports'g for connecting said valve chamber with )ressure pump c. There are shown four equic istant ports and two ports g. As will be seen, ports f t iil'cr from ports g in dimensions, number and arrangement. The four ports of thcvalvc serve to, separately, throw into action the pump (Z, and are arranged crosswise, while the two ports 5 which separately serve to throw pump 0 into action, face one another. In the example illustrated, it is assumed that pump 0 has double the width of pump (1, other conditions being similar. The-space between the ports f and the ports g, constitutes an annular passage in.

In operation, the valve is so fitted within the valve-casing b, that the ports f may, successively, be brought into register with a pressure pipe 1' leading from pump (1, while the ports 9 may, into register with a pressure pipe j leading from pump 6. The casing b is provided with a suction port, Z, common to both pumps, and the valve is so recessed or formed between successive ports. 7 as well as bGtWQGIh successive ports g, that when any port of a series is not in register with the pipe 2', or with the pipe j, the prcssurcfluid from the pump ((Z or'c) passes into the recessed part between ports, into the annular passage 1.: and thence to suction port Z. If the valveis turned, in the direction of the short arrow (Fig. 4) to the position shown in Figs. 3 and 4, the pump (Z is then, through the pipe 2', and one of the ports connected with the valve-chamber c, and, t irough said chamber, with any motor or motors. At the same time, however, the port 9 is not in con1munication with the pipe 7', but the liquid from pump a passes (as shown by the long arrow), by way of the recess between the ports, into the annular passage is and then to the suction pipe Z, for circulation through that pipe. Thus only pump (1 is connected with the valve chamber. Upon further turning of the valve, in the same direction as before, as shown in Figs. 5 and 6, no port 1 is in communication with pump of, while a port 9 has been brought into re ister with the pipe j and only the pump (0% of greater capacity is in communication with the valve chamber. The fluid from the pump. 12 passes byway of therecess between succcssuccessively, be brought by both pumps.

sive ports f to the suction pipe Z, and is circulated through that pipe. In a third. posi tion (that shown in gether) of the valve, both pipes c' and j are in communication with the valve chamber 0 (the suction pipe Z being cut entirely oil) and the combined pressure fluid from both pumps will operate any motor or motors. In a fourth position (that shown in Figs. 9 and 10, read together) of the valve, no port of either set is in communication with a pump, and there is no fluid passing through the valve-chamber; on the contrary, each pump is driving fluid through therecesses between successive ports f and between successive ports g, and, by the annular passage is and suction port Z, fluid is being circulated In this position, the motor or 1noton'-., are cut out and the car is at rest.

Because of the exceedingly high pressure arising when employing fluid transmitting gear, care must be taken that the valve shall be relieved as far as possible. As shown in Fig. 1, this may be assured by having small passages (m, a) in the end 0 of the valve, so that a connection is established with the valve chamber, and thus an efiective relieving is assured.

What I claim is:

1. In combination, a valve-casinghaving a suction port, a pressure-pump connected by a port with said valve-casing, a second pressure-pump of greater capacity and also connected by a port with'said valve-casing, a hollow rotary valve in said valve-casing having a valve-chamber and asuccession of ports for connection of the valve-chamber .Figs. 7 and 8, read toceases with the first-mentioned pump and also having a separate succession of ports for con nection of the valve-chamber only with the seco11dmentioned pump, said valve being also formed to connect a pump with the suction port.

2. In combination, a valve-casing having a suction port, a pressure pump connected by a port with said casing, a second pressure pump of greater capacity also connected by a port with said casing, and a rotary valve in said casing comprislng a shell having an inner chamber extending the entire length thereof and ports formed to successively connect up only the first-named pump for operating a motor, then to connect up only the pump of greater capacity for operating a motor, then to simultaneously connect up both pumps for operating a motor, and, finally, to render both pumps ineffective for motor operation.

3. In combination, a valve casing having a suction port, pressure pumps separately connected with the valve'casing, a hollow valve therein and an annular passage between. the valve and valve-casing and in communication with the suction port, said valve formed for connecting either of said pumps with the interior of the valve or with the annular passage.

In testimony whereof, I have signed my name to this specification in the presence of two subscribing witnesses.

HUGO LENTZ.

Witnesses C. FRANZ,

Ennnsr L. Ivns. 

